Restart Apple Watch Ultra
If something isn’t working right, try restarting your Apple Watch Ultra and its paired iPhone.
Restart Apple Watch Ultra
Turn off your Apple Watch Ultra: Press and hold the side button until the sliders appear, tap , then drag the Power Off slider to the right.
Turn on your Apple Watch Ultra: Hold down the side button until the Apple logo appears.
Note: You can’t restart your Apple Watch Ultra while it’s charging.
Restart the paired iPhone
Turn off your iPhone: For models with Face ID, press and hold the side button and a volume button, then drag the slider to the right. For models without Face ID, press and hold the side or top button until the slider appears, then drag the slider to the right. With any model, you can also go to Settings > General > Shut Down.
Turn on your iPhone: Hold down the side or top button until the Apple logo appears.
Force Apple Watch Ultra to restart
If you can’t turn off your Apple Watch Ultra or if the problem continues, you may need to force your Apple Watch Ultra to restart. Do this only if you’re unable to restart your Apple Watch Ultra.
To force restart, hold down the side button and the Digital Crown at the same time for at least ten seconds, until the Apple logo appears.